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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/javabean/JavaBeanXPath.java,v 1.6 2006/06/03 20:36:00 elharo Exp $
 * $Revision: 1.6 $
 * $Date: 2006/06/03 20:36:00 $
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: JavaBeanXPath.java,v 1.6 2006/06/03 20:36:00 elharo Exp $
 */

package org.navimatrix.jaxen.javabean;

import org.navimatrix.jaxen.Context;
import org.navimatrix.jaxen.BaseXPath;
import org.navimatrix.jaxen.JaxenException;

import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/** An XPath implementation for JavaBeans.
 *
 * 

This is the main entry point for matching an XPath against a JavaBean * tree. You create a compiled XPath object, then match it against * one or more context nodes using the {@link #selectNodes(Object)} * method, as in the following example:

* *
 * Node node = ...;
 * XPath path = new JavaBeanXPath("a/b/c");
 * List results = path.selectNodes(node);
 * 
* * @see BaseXPath * * @author bob mcwhirter * * @version $Revision: 1.6 $ */ public class JavaBeanXPath extends BaseXPath { /** * */ private static final long serialVersionUID = -1567521943360266313L; /** Construct given an XPath expression string. * * @param xpathExpr The XPath expression. * * @throws JaxenException if there is a syntax error while * parsing the expression */ public JavaBeanXPath(String xpathExpr) throws JaxenException { super( xpathExpr, DocumentNavigator.getInstance() ); } protected Context getContext(Object node) { if ( node instanceof Context ) { return (Context) node; } if ( node instanceof Element ) { return super.getContext( node ); } if ( node instanceof List ) { List newList = new ArrayList(); for ( Iterator listIter = ((List)node).iterator(); listIter.hasNext(); ) { newList.add( new Element( null, "root", listIter.next() ) ); } return super.getContext( newList ); } return super.getContext( new Element( null, "root", node ) ); } public Object evaluate(Object node) throws JaxenException { Object result = super.evaluate( node ); if ( result instanceof Element ) { return ((Element)result).getObject(); } else if ( result instanceof Collection ) { List newList = new ArrayList(); for ( Iterator listIter = ((Collection)result).iterator(); listIter.hasNext(); ) { Object member = listIter.next(); if ( member instanceof Element ) { newList.add( ((Element)member).getObject() ); } else { newList.add( member ); } } return newList; } return result; } }




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